The Ready-to-Assay P2Y4 Purinergic Receptor Frozen Cells are a simple, thaw-and-assay cell format for use in studying drug candidates (small molecules or biologics) targeting GPCRs. This assay assesses ligand (e.g. ATP, UTP) based activation of P2RY4 GPCR activity via detection of increasing levels of intracellular calcium. The included cell line overexpresses P2RY4, a naturally Gq coupled GPCR. Upon activation of P2RY4, the resulting calcium activity can be fluorescently assayed. Ready-to-assay kits consist of two vials of the stably modified clonal cell line in a convenient thaw-and-use format. For detailed product information, User manual and datasheet, visit www.discoverx.com/products-applications/frozen-cells.